Nine people. According to the inquiry of official website of Beijing Jiaotong University, the number of graduate students enrolled in 2023 is 3,000, including full-time and part-time graduate students, among which 9 students are enrolled in the unified examination plan for applied mathematics major of School of Mathematics and Statistics of Beijing Jiaotong University. Located in Beijing, Beijing Jiaotong University is a national key university directly under the Ministry of Education of People's Republic of China (PRC), which is jointly established by the Ministry of Education, the Ministry of Transport, the Beijing Municipal People's Government and China Railway Corporation.